DE1903138A1 - Method for transferring a strip-shaped material and device for carrying out the method - Google Patents

Description

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T903T38

33/74. January 13, 1969

PATENT LAWYERS · Reg 121 754

DR.-ING. WOLFF ", H. BARTELS '·

DR. BRANDES, DR.-ING. HERO

7 STUtTGAPJ-N, LANGE STRASSS 51 "

EASTMAN KODAK COMPANY, .Rochester, New York State, United States of America

Method for transferring a strip-shaped material and device for carrying out the Procedure

The invention relates to a method for transferring a strip of material wound into a roll to a work station in which the material is warp-free should lie, as well as a device for performing the-. this procedure.

The manner in which such a transfer takes place is particularly important with films because the quality of the transparencies and copies is reduced if the "B ¹ IIm" B 1 IIm, which is pulled off the supply roll and transferred to the exposure station, is not free of bulges in the image plane of the optical system.

In the well-known cameras where the film supply is rolled up "is and this role rotatable in a storage kaiimerj is formed either by the camera housing or the storage compartment © iner film cassette, the latter

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also in whole or in part. the exposure window and / or form the film receiving part. Regardless of these differences, all known constructions have the feature on ,, that the filmstrip is guided to the exposure window in a path which is one or has several relatively abrupt changes in curvature, in particular at the transition from a curved portion of the film path to a rectilinear portion that is in the same plane as the image plane and leads to the exposure aperture. If the charged camera is not continuously, but rather with longer periods Interruptions that are used are taken by the person The section of film that is in the area of the abrupt change in curvature adopts this curvature, which causes the film has a so-called line deformation, i.e. one running across the film on one side Stripe of limited curvature, preserved. The next time this film is transported on, the curved film arrives Stripes in the exposure opening and leads to a deterioration in the flatness of the 'film in this for it particularly sensitive position.

The invention is based on the object of a method to create that allows a strip-shaped material, in particular a film, from a roll in to transfer a work station so that it is in the Work station is free of bulges. This task is according to the invention solved in that the material is curved in the same sense as the roll, but one larger radius of curvature than this, which is free of discontinuous changes in curvature, is guided, both in the outermost turn of the roll and

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the level of / work s st at ion tangent ial 'transitions. That Material is not in any area of the web, exposed to strong changes in curvature, so that it leeks then. > resulting bulges in the workstation Deformations remain free if it is in the transfer path for a long time.

In the case of a material that has sections of the same length that are to be conveyed step-by-step into the work station, it is expedient to select the section to be conveyed next to the work station from the end of the conveying process for the previous one in the work "StafcLon-. conveyed section until the beginning of the conveying process bringing it to the work station in the path along its entire length, so that it is ensured that the entire section is not subjected to any deformation leading to buckling. provided that ■ length of the guide track coincides with the length of the individual sections of the streifenföraigen material and each one of these sections is in the web, while another is located in the work station, it 1st likewise "" appropriate to the 3ahn tangentially into the outer turn between the role and the workstation. However, this is not always necessary, because in some cases it does not matter if between In two successive sections of the strip-shaped material, a line deformation

is available.

The invention is also based on the object of a Device for carrying out the method according to the invention to accomplish. Based on an introductory

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Direction for serape-shaped material, which extends slefc from a supply roll to which the stick-shaped material is wound _$ su eini »Apbe its st ation 'ila; j, is this © task e-according to the invention, that the flow device has a 'smoothly curved' _s _but a greater, Kr-'üinnmrigsrauius than oils = se showing ^ of discontinuous ICr-iuiirnungsanoGruiigeii for the guideway 'has - at least in the Ebsiia of work s st at ion merges tangentially.

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A portion of a spiral is particularly advantageous for such a track "shape to work sstat ion towards decreasing curvature. But it can be even with track shapes achieve good results that have a constant curvature _s if the radius of curvature is sufficiently large ..

The invention is explained in detail below with reference to various exemplary embodiments shown in the drawing.
Show it:

Fig. 1 is a perspective view of one Two-compartment film cassette which is a first embodiment of the invention 'Owns leadership for the film,

Fig. 2 is a section along the line 2-2 of Fig. 1,

3 shows a cross section along the line 3-3 of FIG. 1 through the cassette and a camera, in which this cassette is inserted,

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4 shows a section of the pig. 3 with one compartment of the cassette, in an enlarged view Scale,

5 shows an incomplete cross-section by means of a modified embodiment of the film cassette according to FIGS. 1 - 4,

6 shows a cross section through a previously known film cassette,

A film cassette designated as a whole by 11, of the type with two compartments, has a housing 12 and a cover 13 which closes it and which together form a film supply compartment 14, a film receiving compartment 15 and an intermediate part 16 connecting these two. Before the cover is put on and connected to the housing 12, a spoolless film roll 17, which contains one end of a film strip 18, is placed in a film storage chamber 19 of the storage compartment 14, in such a way that the front end of the film strip passes through a Passage 21 extends through into an exposure opening 22, where it rests on a flat surface of a wall part 16 between two guide lips 23 running in the longitudinal direction of the film Inside the receiving chamber 24, the beginning of the film is attached to a take-up core 26, which is rotatably held at both ends between the bottom 27 of the receiving compartment and the opposite end wall of the receiving chamber formed by the cover 13. The exposable part of the 909841/0869

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With this cassette, the film strip 18 is initially in the storage chamber, from which it can be gradually transported into the exposure opening 22 and into the receiving chamber 2k by rotating the winding core 26. The exposure opening 22 is delimited on the one hand by the guide lips 23j on the other hand by the exit of the passage 21 and the entrance of the passage 25. The size of the exposure opening 22 is adapted to the size of the individual image-producing sections of the film strip 18. The passage 21 ends at the edge of the exposure opening 22 and at this point runs tangential to the plane in which the exposure opening is located.

3 shows the cassette 11 inserted into a camera 28. The camera 23 has an outer housing 29 with it a cover 31 and pivotally mounted on this

an inner carrier 32, which is a hollow body with a rectangular cross-section and carries the lens system 33 of the camera at one end. The cross section of the carrier 32, the longitudinal axis of which lies in the optical axis of the lens system 33 and which extends towards the cover 31, increases steadily. The end facing the cover 31 is open. The lid 31 facing back side of the inner bracket '32 forming abutment surfaces 3-U for the film and is located in the image plane of the lens system 33. On the contact surfaces 3 ¹ J, the edge strips of that film portion applied to the currently in the Belichtunrsöffnung 22 the cassette is located when the latter is inserted into the camera and through an underneath

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irüokt: '"..:,. ·'-;. ^Λ --'-- J"^; ..: ^ ;;. f "surfaces 5 and the - ■ '■ - / ^: * 7 ο;" ϋ ^ -;., £ ■ *'; £ ■: isii * alco iur ir'.ldung ₅ who expose the su ^ r; Be-13 iS lying flat in the picture fold, whereby of course the smulsioiiseite of the film lies on the side facing the lens system. The winding core. 26 is coupled to a conventional pilm conveyor mechanism, not shown, which allows the winding core 26 to rotate in order to gradually transfer the film across the film stage into the take-up chamber. Since the flexible, jecloüh abeshnittsweise deformable film strip 18 anfänglieh wound in the film supply chamber, has ex ¹ a curvature when brought In'die film stage "If the hold the film residing curvature is -verhältnismäßig uniformly and constantly, yet may the be exposed The area in the film carrier is kept sufficiently flat because the edge strips of this area between the front of the wall part 16 and the contact surfaces 34 are held in place with moderate pressure. This pressure is so low that it does not prevent free transport through the film carrier. However, if the film strip has a line shape or a local area extending in the transverse direction of the film with a relatively strong curvature, it is impossible to get this area of the film flat between the holding surfaces of the film carrier without the pressure in the film carrier to increase that a free shift of the film through the film stage is no longer possible. In addition, even if the

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local deformation in the edge areas due to the holding surfaces the film carrier could be removed, 'it would be impossible to remove the deformations in the central area.

To explain in more detail how the The above-mentioned line deformations or local deformations of the film occur in the known film cassettes 6, such a cassette is shown which has a film supply compartment 37 similar to that of the embodiment according to FIGS. 1 to 4. However, the shape of the passage is different. With this well-known Construction has the film recording comb he 38 'a substantially cylindrical film roll space, in the tangential a rectilinear passage 41 opens, the lies in the plane of the "exposure aperture. In Fig. 6 is the film in the cassette is not shown, The Film supply roll is lying down when the cassette is full in the chamber 38, wherein the beginning of the filmstrip extends through the passage 41 through to the taking chamber into the Filmauf. Due to the tendency of the rolled up film to enlarge the diameter of the roll, which is compared to the opening of a coil spring can be, the outermost turn of the; Roll the shape of the curved inner surface '42 of the chamber 38 at. The film section to be transported next into the exposure opening is therefore in the Time between two exposures, which can be very long, partly in.dem passage 4l and partly on the curved one. Inner surface 42 ah. This gives him a local, curvature leading to a bulge in the transitional

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area 39 · This curvature prevents this film section from lying flat in the exposure plane of the exposure aperture. So it should be decisive for this mistake be, 'that the film section is only one in a strip Has undergone line deformation and the remaining parts unaffected stayed.

The inner design of the film supply compartment, of the cassette 11 is best shown in FIG. 4. A uniformly curved inner surface 45 of the film supply chamber 19 is at least almost concentric to an axis 46 and extends clockwise from a radius vector 47 to a radius vector 48 .. This part of the inner surface forms a cavity 49 for the film roll which ensures that the substantially cylindrical shape of the film roll is maintained when it is inserted into the. Cavity 49 pops up. In connection with this cavity: however, the curved inner surface 45 runs in the 3ereieh between the radius vector 48 and the edge 50 of the exposure opening 22 along the section of a spiral with increasing radius of curvature, the beginning preferably being at a point on the wall which is about 90 ° is offset with respect to the exposure plane, and an infinitely large radius of curvature is reached at the edge 50. The camber-shaped curved passage 21 has a continuously changing curvature in the exemplary embodiment. The passage can, however, also be formed from a multiplicity of curved sections with the same radius, these sections being joined to one another in such a way that a smooth curve develops; with increasing radius results. The curvature. is -mathematical. - ^: ■

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defined as the amount of change in the direction of a curve and is the reciprocal of the radius of curvature * The curve which the passage 21 follows has at the point where. it touches the outer turn of the film roll in the storage chamber., a curvature that is equal to the curvature of this outer turn or the curvature of the inner surface 45 of the supply chamber 19 ", '. Because the roll normally pops open so far that the outermost The curvature of this curve is zero at the other end, which is tangent to the plane of the exposure opening 22 along the line defined by the edge -50 Embodiment is the case, change continuously, -. However, a change in a finite number of sections can also be provided. - .., - can be seen. ', ...... V ■ -.-- ..

The length of the passage 21 is equal to the length of the film section assigned to an image or, more precisely, equal to the so-called field division, that is the distance from a certain point on a . frame ,; to the corresponding point of a benachbarten.Bildfeldes leads such a design of the passage, but · / to a greater length of the same and, consequently · -, ■: ■ · ': a larger cartridge or guide means as ..,.. .. they would otherwise be necessary ■ For this basic actual mög-- it -. _β 'borrowed that some cameras and film cassettes and .Film-, .-> magazine not erf with the "indun ^ film guide sgemaften.. - ■ ·.; - _: can be provided. In these cases, it was found that even if the length of the passage has to be selected to be smaller than that of an exposure field, the image quality is improved by improving the

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Flatness of the film as a result of using an according to the invention curved guideway essential light improved is. Where it is desired, the cassette is small and therefore .Keeping the passage short can improve the evenness of the film through the use of the invention curved guideway and thereby improved that the guideway is made as long as possible, that means, lets them begin on a line of the inner wall of the storage chamber and leads to the edge of the exposure opening, as well as tangential to them. these lines can pass into the subsequent parts of the film web. A more uniform curve shape is more advantageous Decrease in curvature from the outermost turn of the supply reel to the edge of the exposure aperture, where the curvature should be zero. Where such a curve cannot be realized, "is but a constant curvature can also be used. The curvature could also be zero »However, this would require a relatively long cassette.

FIG. K also shows how the radii of curvature of the passage 21 change. The origin of the radius vectors 48, 51b, 52b, 53b and 54b is denoted by, 46 or 51a or 52a or 53a or 54a, -lan sees that this guideway has a steady, gradual transition of the curvature from the film roll to the exposure stage results, so that that film section, which is next in the exposure opening; is not subjected to any abrupt changes in curvature.

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A correspondingly curved surface 55, which is formed in part by a lip 56 , is arranged opposite the part of the inner surface 45 which is furthest out of the plane. · The distance of the surface 55 from the one opposite it. Part of the inner surface 45 is always the same and is selected to be somewhat larger than the thickness of the film strip 18. Probably the curvature of the passage 21 as well as the fact that the film strip 18 dl · cross-sectional area of the passage 21 essentially fills, lead to

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to that / light can penetrate through the passage into the film supply skaiuner. An additional light barrier is therefore not necessary. The opposing surfaces of both passages of the film cassette can be provided with a transverse, saw-hard corrugation, as is already known to continue to reduce the possibility that & light as a result of multiple reflections on the facing surfaces of the film strip and the aperture * enters the film supply chamber.

In addition to the advantage that the film lies flat in the area of the exposure opening, the elimination of abrupt curvatures in the film path also leads to a reduction in the frictional resistance exerted on the film by the guide path. For this reason it is also expedient to provide the same guide track for the film receiving chamber, as shown in FIG. 3. ■; ' , ^;

The curved inner surface 45 described above is defined by a special type of curve, which also includes those with successive small ones

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curved sections with increasing radius of curvature. The inner surface 45 also fulfills its purpose, if their course is described by other types of curves. ben lets, for example, a parabolic curve that ι an infinitely large radius of curvature at "the point of the tangential transition into the exposure plane. at the edge of the exposure aperture; owns. Accordingly by reference to axes or radii of ' Curve sections are not assumed to necessarily have a finite number of curved sections ... form the path with an identical, curvature. Rather, in reference to stringed arc sections with a determinable radius e.a convenient option seen defining a curve that very- well approximates the curve under consideration.,,:. , - -

In addition, it must not be overlooked that more guide surfaces, which are arranged at a distance from one another, are attached to the Place the only one shown in the exemplary embodiment, uninterrupted inner surface 45 could connect to the ... To keep the film roll in the desired position, and -the Guide track for the film strip, from. the .roll; -to.-... Exposure aperture to form .. _. ■ '.-._ _ - ..:; , ■

5 shows a film 3. Se et te ..- 57 ,,. Which -..- is designed in a manner similar to that of the film cassette 11. The part of the inner surface 58 of the FiImνorratskammer between the radius vector 59 and the radius vector of oil at a rotation _direction: AM-clockwise direction defines a substantially cylindrical, -.sur. ^; Axis 63 concentric cavity 62- for-the; F4.1mroUe-. '-., Between the cavity 62 and an opening 64 of a through

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However, the inner surface 58 runs along a single arc section, which is tangent to the flat surface 66 of the exposure platform and whose center of curvature 67 lies outside the corner. In this exemplary embodiment, the radius of curvature of the 'film strip, which is located next to the' picture stage and which is represented by the radius vectors 68 ^s and 69, is approximately three times greater than the maximum radius of the film supply roll. This radius of curvature could be increased still further if one were to change the position of the center of curvature '67 relative to the film cassette which the film experiences, necessarily more pronounced than in the embodiment according to FIGS. 1 to M, but still considerably weaker than in the known cassettes, although here the change in curvature is not as gradual as in the embodiment according to FIGS. 1 to H. , local deformations of the film are nevertheless essentially avoided compared to known cassettes.

Both of the exemplary embodiments described are special types of double-chamber film cassettes. The invention is self-evident as is the case with other types of dual chamber film cartridges applicable including those in which the filmstrip is covered with a strip of protective paper and those in which other means are provided to hold the film in the exposure aperture. Furthermore, the invention can also easily

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b «i single-chamber magasines are used, i.e. with- ' for example magazines for film of size 135. Also in cameras that work with conventional roll film, the invention can be used to advantage. here only needs the guideway according to the invention < To be provided in the camera itself. In the end the invention is also applicable to other devices, that use other types of strip material, which is initially rolled up and used lying flat, keeping it as flat as possible in a work station.

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Claims (1)

.P at e n't · a η s ρ r ü c "he 1. Method for transferring a wound into a roll In the form of a strip of material, to a work station in which the material is arched-free is, characterized in that the material is curved in the same sense as the roll., however, they have a larger radius of curvature than these, which are free from discontinuous changes in curvature Web is guided, both in the outermost turn the role as well as the plane of the workstation is tangential transforms. 2. The method according to claim 1, characterized in that that in a material that has sections of the same length, which successively gradually in the work station to be funded is the next section to be funded in the work station from End of the order process for the previous one in the work station funded section to the start of the funding process that brings it to work is kept in the web along its entire length. 3. The method according to claim 1 or 2, characterized in that that the material is guided on a path forming a section of a spiral with a curvature decreasing towards the work station " 909841/0 86 ^ 9 k, The method according to claim 3 \ characterized in that in the case of a film strip which is to be withdrawn from a supply and-.one the. Work its stat ion forming exposure opening is to be fed, the film strip in * the web is led to the edge of the exposure opening . - ■ - ■ '■■ -. ,. . 5. Device for carrying out the method according to one of claims i to 4, with a guide device for .strelfenförme material, which extends from a supply roll to which the etreifenfömige material is wound to a work set at ion, characterized »that the guide device has a guide path (21,65) which is curved in the same direction as the hollow (17) but has a larger radius of curvature than this, free of discontinuous changes in curvature and which merges tangentially at least into the plane of the work st afcion (22) . . 6. Apparatus according to claim 5, characterized in that that the guideway (21) has the shape of a section of a spiral with decreasing towards the work s st at lon (22) Has curvature. ■ 7. Apparatus according to claim 6, characterized in that that "the spiral has a uniformly decreasing curvature. ■ · '·. 909841/0869,: ■■ BAD ORIGINAL 8 .. Device according to claim. 5, thereby _; gekennseloimet _h that the. Guide track (65) has a constant curvature * .- · .-, - ■ - .- .., ·· ..., -. ,, - ■ _ -..-: .. - ■ 9. Device according to one of claims 5 to 8, characterized in that the guide unit (21) In one. Film cassette (11.57), dl · tin · Pllmyorr · *! ·. chamber (49,62) and a device for formation has a planar reference opening (22,66) ,. is provided. 10. The device according to claim 9, dadurchgekennzeiohnet, that the guideway (21) is tktnmer from the supply (^ 9) bi "" around a cattle (5Q) dar ^ itlichtuniieffteing 11. The device according to claim 9 or | O _e characterized β ·· that the length of the fQhriingsbahn C21) essentially equal to the length # ia ·· the ever Image selected sections of the lilies 12. The apparatus of claim 5 or SV thereby gektnn records that the guide track (65) between dfp. , _v · outlet opening (6 ^ 1) of an Ian. inner cylindrical storage chamber (57) of a film cassette and. from the-. Lifting point of the film From entry to the stock skimmer rotatable, stored film roll-lies and. In the bore it h of both ends has a radius of curvature which is at least three times as large as the radius of the inner space (62) of the storage chamber (57). 909841/0389 BADiDR (QfNAl. • t · - 19 - 13. Device according to one of claims 9 to 12 thereby characterized in that the curvature "of the guideway voir decreases progressively from one end to the other. . ' Ik, device "according to Ansorueh 12" or 13 * characterized in that the guide track has a curved inner warid surface (45, 58) within the storage chamber as a contact surface for the film, 15. Device according to one of claims 5 to 14, da- * characterized in that in a film magazine (11) with a film supply compartment (14) which has one end of a film strip ( 1.8. provided ¹ intermediate part (1.6), which has a flat contact surface to form a straight film path · which is "I'Mihrunnsbahn (21) is formed by parts (587" of the storage compartment (14), ^ and at least part of the Film section it can be placed between the roll (17) and the rectilinear Fül.runfrsbahn, wherein the center of curvature (54a) of the film web in the area of the end adjoining the rectilinear film web outside of the supply line. ' ^: partly (14) - lies. ■. , 90984 1/0869 BAD OBIGINAL, ³ y 3 3 T90M38 - 20 - 16. Device ¹ according to claim 15, characterized in that the center of curvature (54a) on a .. · between the two compartments (14 ^ 15) perpendicular to the straight part of the Pilmbahn and · ■ on the film path In the area of the tangential over. '' · ". gangs from the curved part to the straight part · '· -' ■ -; the impinging line. , · ''. · 17t device according to one of the speeches 5- to .8-, characterized by ·. that the Pilmbahn in one. '.'- camera is arranged, in which a film after and' ·· according unwound .. · 'supply roll of a substantially cylindrical PiIm- and by the working ^".."; . step-by-step station "educational lighting ε st at lon guided,: .. ·." is, in which a flat pilm carrier surface, as. Ahlposition. ·. "Area for the film section located here >'■' ■ ■ is provided, and that that section of the '·' determined by the guideway Part in the exposure station adjoins, has a center of curvature ._; '·' point outside of the supply roll. ". ' l8. Device according to Claim 5, characterized in that the guide track is in a film magazine. a chamber ¹ is arranged, which is able to hold a substantially cylindrical roll of film and has an outlet slot, and that the film path defined by the guide track adjoins the roll tangentially and runs in a spiral to the outlet slot , whereby the guideway has the shape of a ^ by stringing together a large number of circular arcs 909841 / 0869- BAQ ORIGINAL - 21 - Pieces of curve formed with increasing radii corresponds. ; . ■■ -..- ·; -'- ' 909841/0869